At times, 21-year-old Kristaps Porzingis sounds like a wizened veteran. He admits he wants to be a leader next season. Certainly Porzingis has been outspoken. According to Porzingis, he thought the Knicks were doomed early, seeing a lot of talent in their newly formed Big 3 and a lot of alarming signs of a lack of teamwork and chemistry. As the defensively inept Knicks face the Clippers on Monday to begin a four-game western trip, Porzingis, Carmelo Anthony and Derrick Rose will each suit up despite their team being all but mathematically eliminated from the playoffs. But Porzingis, who missed the Nets loss Thursday but practiced Sunday and expects to play against the Clippers despite his bruised thigh being “a little tight,” may not be paired with Rose and Anthony for much longer. With the club at 27-42 and seven games out of the eighth seed with 13 games to play, the Knicks version of a Big 3 probably won’t be back next season. In fact, odds are only Porzingis returns. Rose is a free agent and Anthony is expected to land back on the trading block this summer.